Using the search function, I just replied to this thread: #17 What do you think of the potential impact of near-silent vehicles in HK? Although not the worst place in the world, sound does play an important role here. As so many people are walking around with their head buried in their smart phone, it's a matter of time before Apple Daily write about how an evil, silent electric car caused the death of a texting teenager. Or similar. And EVs will be blamed, just as they are blamed for fires, lack of range and many other things. Whether or not you think it's peoples own fault when they don't see where they are going, it will be more and more of a problem as the number of EVs in HK will increase dramatically, starting this summer. No matters who's fault it is, if some adaptive and intelligent sound generating system can prevent injury and death, I am all for it. I for one, want something which is either automatic, or that I can activate on demand - to make people discretely but efficiently aware of the presence of a vehicle, without having to honk at them.